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(No'ModeL S. D. FIELD.

PRINTING TELEGRAPH. No. 274.748. Patented Mar.27,1883.

.WM www /k/ 7 Mt, ATTORNEY N. PETERS. Pnololhhogmpher. wmhington D. C.

l i l UNITED STATES PATENT OFFICE.

STEPHEN FIELD, OF NEW YORK, N. Y.

PRINTING-TELEGRAPH.

SPECIFICATION forming l, part of Letters Patent No. 274,748, dated March 2'?, 1883.

l Application filed March 3, 1853. (No model.) I

` State of New York, have invented a new and useful Improvement in Printiug-Telegraphs;

and Ido hereby declare that the following is a full and exact description ot' the same,ref erence being had to the accompanying drawings, and to the letters ot' reference marked thereon. Y

My invention relates generally` to that class of printing-telegraphs in which two typef wheels are used, arranged to print in parallel to be printed from.

lines upon onelillet or band of paper, the wheels being propelled"step by step byma magnetic escapement, and in which a tendency to constantrotation, given by a motive-power to the shaft carrying the type wheels, is changedto an intermittent or step-by-step motion, so that each character may be positioned in rotation g-gp Itespecially relates to the means for determining at will which one ot' two type-wheels shall be printed from at any particular time, to `the means forV feeding the paper baud or llet after aniimpression thereou,and to the means for securing correspondenceot' action, or unison ,77 as it is generally termed,bet`ween one or more instruments in circuit and the transmitter.`

In carrying `my invention into practice a motive power is applied to the shaft carrying the type-wheels, and an electro-magnetic escapement is used, regulatingthe stress'ot' the motive power upon the shaft in the well-known manner. Uponthe shaft one type-wheel is rigidly or directly mounted, while the second type-wheel is upon a sleeve somewhat larger than the shaft, and connected thereto by a compass-gim bal attachment, so as to be caused to rotate therewith, and yet have a play vertically thereon. Loose upon thesleeve is a colA lar, within which the sleeve may rotate, and having a spring normally pulling the sleeve up -as far as the'difterence in diameter of the shaft and sleeve permits, so that the upper and lower edges of the two wheels are in different planes, the second named,`or the one on `the sleeve, being normally raised above the other. The platen or press is-carried by an independent frame having a spring or other retractor to keep it normally away from the wheels. Underneath this frame, and adapted to strike thereon and lift it up, takes an arm from .the armature of the press-magnet, which is a polarized electro-magnet, to the end that, as the armature is attracted to one pole, the arm may lift the platen to one wheel., but when attracted to the other pole the second wheel may be pulled down to the platen, which then remains stationary. 1n the press-magnet circuit is placed a second magnet-an ordinary electro-magnet-whioh controls the unison and paper-feed devices. The printing-circuit is to be kept normally charged toa small per cen t.- say ten to twenty per cent-of the normal y printing-current, the springs or other retractfors connected with the printing mechanism being so adjusted that the magnetismdue to this small per cent. ot' current shall not be suficient to overcome their resilience. The armature-levers of this second magnet have a spring ot' such low resilience that its ei'ect is overcome by the magnetism due to the small` normal charge. It carries a pawl engaging with a ratchet on a wheel over or under or around whichthe paper passes, and it carries also a hooked arm adapted to contact with a unisonstop on one ot' the type-wheels, or on some member of the type-wheel train wherein the circuit is entirely broken. The free end of this armatnre-leveritakes under a free end ot' a lever having a strong retractile spring so acting,in effect, as a stop while the magnet is only weakly charged. Ordinarily the magnetism dne to the weaker charge attracts its armature till stopped by the stronger spring. This is sufficient to keep the unisonarm ont ot' operation. Upon fnll charging, the armature is attracted the full distance, carrying the pawl into engagement with-a t'reshratchet-too'th on the paper-feed, and so operating it upon withdrawal of the printing-current. tire break in the circuit the armature is drawn Upon au euaway entirely by its spring and the unisong vention, and Fig. 2, a view in section of the type-wheel shaft and sleeve carrying the secondftype-wheel.

4 4 is the main escapement-circuit, in which is located l-the polarized electro-magnet A, whose armature B is formed into an anchor taking in the escapement-wheel G, mounted on shaft G, and forming an electro-magnetic secapement regulating and controlling the action of any suitable prime motor (not here shown)-on the shaft.

1 2 are two type-wheels, 1 being mounted directly and rigidly upon the shaft. The wheel 2 is mounted upon a sleeve, E, somewhat larger in diameter than the shaft. This sleeve is attached to the shaft by the compass-gimbal attachment F, so that it and its type-wheel are caused to rotate with the shaft, while a certain amount of motion is permitted to the sleeve in a direction at right angles to the line of the shaft. The construction of the compass-gimhal attachment enables this to be done. In it the arm o is attached to the sleeve E, and its ends pass loosely through the slots or apertures in the ring or band, while the arm o is attached to the shaft, and at its ends passes loosely through the band at right angles to v. For the purpose of distngu-ishingthese wh eels,

wheel l will be termed the rigid type-wheel and wheel 2 the loose type-wheel.

t is a colla-r passing looselyaroundtheshaft, and within which the shaft is permitted to rotate. Attached to this collar is a spring, c, whose stress tends normally to pull the sleeve up to its limit of motion, lifting wheel 2 so that its lower edge is in a higher plane than is the lower edge of l.J

From the lower side of the collart depends a strap, rod, or oord, b, attached at its lower end to an arm, a, of the armature H of the press or printing magnet D, which is a polarized magnet in a printing-circuit, 3 3. Another arm, t', projects from the same armature, and is arranged to take under some portion of the frame W, which carries the platen J, located beneath the type-wheels l 2, the frame having an axis, K, journaled in suitable supports. A spring, d, is attached to the frame and holds it normally from contact with l 2, while a stop, c, limits its backward movement due to d. The springs'c d are adjusted so as to have about equal degrees of resilience and a degree requiring about the full power of the magnet D to overcome.

In the printing-circuit3 3 is arranged an eXtra magnet, L, ot' the ordinary type, having an armature-lever, M, pivoted in the usual manner atacar. .A sprin g, f, of low powersay one-tenth, or thereabout, the power of the magnet L-is attached to the lever, whilea stop, fn, limits its backward play. The free end of this lever takes under the free end of a pivoted lever, o, having a back stop, p, and a spring,f, of full power.

Projecting upwardly from the lever is the hook-arm T, adapted to eontactwithastop,P,on

wheel l when drawn forward'by the action of' springfon M. The stop P may beon either wheel, or on any member of the type-wheel train. Another arm, gfprojects from the same lever, forming a pawl whose free end engages with the teeth of a ratchet, O, mounted on the paper-feed wheel N, suitably journaled ath 71,.

The line 3 3 `is, kept normallycharged to, say, ten per cent., or thereabout, ot' the cnrrent to be used in printing.

The arrangements being `as indicated,the operation is as follows: Alternating pulsations vare sent from the transmitting-station over line 4 4 untilthe type-wheels* are brought to the desired point. Supposed) is so arranged that a zinc current will cause H to be attracted to z. If the rigid wheel lis to be printed from, a full-strength zine current is nowl sent over 3 3, H is attracted to z, and t' throws J and the paper passing over it against l, spring C pulling 2 up, so that it cannot be printed from. This full current has caused M to be attracted completely toward L, against the stress ot' both springsff, carrying ginto contact with a fresh ratchet-tooth on 0. The increment for printing being now taken oft' from 3 3, the springs c d, beingof about equal resilience, tend to place H in a neutral position, while f pulls M partially away from L, causing g to turn O the space ot' a tooth and operate the paper-feed. It' it now be desired to print from the loose wheel 2, after it is properly positioned, a full-strength copper current is sent over 3 3 and H is attracted to z', 'pulling down upon the platenJ the paper and the wheel 2 by means of the intermediaries a b, the other operations being as above detailed. When it is desired to operate the unison de vice the circuit 3 3 is entirely broken,so as to discharge magnet L. Springfthen pulls down M, bringing T into the path ot' P. The wheels are then caused to make a revolution, or part of one, until P and T contact, locking the wheels. The circuit 3 3 is then made. L attracts M and releases T from P.

The framing of the machine, supports for the axes or journals, motive power,inking devices,paperreel,rollagainstwhichNtalres,&c., are not shown in the drawings or described herein,as they are of the usual and well-known construction and form nopart ot' myinvention, while their omission aids in the more clearshowing of the matter ot' invention.

Having thus described myinvention, what I claim, and desire to secure by Letters Patent, 1s-

' 1. In a printing-telegraph having two typewheels, the combination of a single electromagnetic escapement, a type-wheel mounted directly and rigidly upon the shaft, and a typewheel mounted on a sleeve loose upon the shaft and connected to rotate therewith, substantially as set forth.

2. In a printing-telegraph, the combination of two type-wheels revolving in unison,one of said type-wheels being capable of movement IOO Io: i

in a plane at rightangles `to `the axis of `rota-p` tion, so that `it may'` recede froln'oi" `approach to the platen, and a platen movable to and from thetypewheels, substantially as i set forth.

3. In a printing-telegraph, the combination, `in the-printing-circuit,of a magnet controlling 'the printing mechanism, and a magnet con-j trollingthe paper-feedand the unison `mech-` anismsubstantially as setforth."

4. The combination of the rigid type-Wheel, the loose type-Wheel revolving in unison ytherewith and capable of independentmovement in a plane at right angles to the axis of rotation,

` a platen commento both Wheelsand movable to and from the same, and mechanism, substantially as described, for actuating and controlling theV movement of saidparts, whereby7 in the operation of printing from therigid type- Wheel `the platen is actuated to move to and from the wheel, and inthe operation of printzo ing from the loose type-wheel the saiol loose type-wheel is actuated to move to and from the platen, substantially as and for the purposes hereinbefore set forth.

This specification signed and witnessed this 25 1st day of March, 1883.

. STEPHEN D.' FIELD.

Witnesses:

MELLEN SHINER,

Gno. W. CASPER. 

